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| 1 | /* | |
| 2 | * Copyright (c) 2000-2005, University of Salford | |
| 3 | * All rights reserved. | |
| 4 | * | |
| 5 | * Redistribution and use in source and binary forms, with or without | |
| 6 | * modification, are permitted provided that the following conditions are met: | |
| 7 | * | |
| 8 | * Redistributions of source code must retain the above copyright notice, this | |
| 9 | * list of conditions and the following disclaimer. | |
| 10 | * | |
| 11 | * Redistributions in binary form must reproduce the above copyright notice, | |
| 12 | * this list of conditions and the following disclaimer in the documentation | |
| 13 | * and/or other materials provided with the distribution. | |
| 14 | * | |
| 15 | * Neither the name of the University of Salford nor the names of its | |
| 16 | * contributors may be used to endorse or promote products derived from this | |
| 17 | * software without specific prior written permission. | |
| 18 | * | |
| 19 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" | |
| 20 | * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
| 21 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
| 22 | * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE | |
| 23 | * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR | |
| 24 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF | |
| 25 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS | |
| 26 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN | |
| 27 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) | |
| 28 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE | |
| 29 | * POSSIBILITY OF SUCH DAMAGE. | |
| 30 | */ | |
| 31 | ||
| 32 | package issrg.pba.rbac.xmlpolicy.ifstatement; | |
| 33 | ||
| 34 | /** | |
| 35 | * This is the class for Operator node of the IF-statement. Its functionality is | |
| 36 | * very much determined by OperationNode, which is | |
| 37 | * configured to deliver the following semantics: | |
| 38 | * | |
| 39 | * <p>This operation expects no or any number of Terms of any type, and | |
| 40 | * returns a | |
| 41 | * value of type determined by the matching Interpreter. | |
| 42 | * There must be an interpreter for | |
| 43 | * the required set of Terms, and it implements the semantics of the evaluation. | |
| 44 | * | |
| 45 | * <p>It is possible to register the interpreters for specific | |
| 46 | * combinations of Terms. Use registerOperatorInterpreter method to do that. | |
| 47 | * There is no default Interpreter. | |
| 48 | * | |
| 49 | * @see #registerOperatorInterpreter | |
| 50 | * | |
| 51 | * @author A.Otenko | |
| 52 | */ | |
| 53 | public class OperatorNode extends OperationNode { | |
| 54 | public final static String OPERATOR_NODE = "Operator"; | |
| 55 | ||
| 56 | /** | |
| 57 | * This method should be called to register the node with the XML Parser | |
| 58 | */ | |
| 59 | 21 |
 public static void register(){ |
| 60 | 21 | try{ |
| 61 | 21 | issrg.pba.rbac.xmlpolicy.XMLPolicyParser.registerXMLNode(OPERATOR_NODE, OperatorNode.class); |
| 62 | }catch (NoSuchMethodException nsme){ | |
| 63 | 0 | nsme.printStackTrace(); |
| 64 | } | |
| 65 | } | |
| 66 | ||
| 67 | /** | |
| 68 | * This method maintains a register of interpreters for specific combinations | |
| 69 | * of Terms for the specified operator. If no special interpreters are | |
| 70 | * registered, the evaluation error | |
| 71 | * occurs. The semantics of the interpreters ensure the semantics of | |
| 72 | * evaluation of the operator. | |
| 73 | * | |
| 74 | * @param name - the operator name | |
| 75 | * @param i - the Interpreter instance that can evaluate the expression | |
| 76 | * for some combination of Terms | |
| 77 | * | |
| 78 | * @see Interpreter#evaluate | |
| 79 | */ | |
| 80 | 0 |
public static void registerOperatorInterpreter(String name, Interpreter i){ |
| 81 | 0 | OperationNode.registerInterpreterForNode(OPERATOR_NODE+" "+name, i); |
| 82 | } | |
| 83 | ||
| 84 | 0 |
protected OperatorNode(){}; |
| 85 | ||
| 86 | /** | |
| 87 | * This constructor builds a OperatorNode given the XMLPolicyParser and the | |
| 88 | * set of | |
| 89 | * attributes of this XML element. It expects that there are no or many | |
| 90 | * child nodes. It expects there is a | |
| 91 | * issrg.pba.rbac.xmlpolicy.XMLTags.NAME_ATTRIBUTE ("Name") attribute in this | |
| 92 | * XML element. | |
| 93 | * | |
| 94 | * @param p - the XMLPolicyParser that builds this LtNode | |
| 95 | * @param attrs - the attributes of this XML element | |
| 96 | * | |
| 97 | * @throws issrg.pba.rbac.PolicyParsingException if there is no | |
| 98 | * issrg.pba.rbac.xmlpolicy.XMLTags.NAME_ATTRIBUTE in this XML element | |
| 99 | */ | |
| 100 | 0 |
public OperatorNode(issrg.pba.rbac.xmlpolicy.XMLPolicyParser p, org.xml.sax.Attributes attrs) throws issrg.pba.rbac.PolicyParsingException { |
| 101 | 0 | super(OPERATOR_NODE, attrs, -1, -1); |
| 102 | ||
| 103 | 0 | String opname=(String)getAttributes().get(issrg.pba.rbac.xmlpolicy.XMLTags.NAME_ATTRIBUTE); |
| 104 | 0 | if (opname==null) throw new issrg.pba.rbac.PolicyParsingException(issrg.pba.rbac.xmlpolicy.XMLTags.NAME_ATTRIBUTE+" attribute was expected for "+OPERATOR_NODE); |
| 105 | 0 | name = OPERATOR_NODE+" "+opname; |
| 106 | } | |
| 107 | ||
| 108 | } | |
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